package com.aiwei.tdjk.utils;

import com.google.zxing.LuminanceSource;

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;

public class BufferedImageLuminanceSource extends LuminanceSource{
	 private final BufferedImage image;
	   private final int left; 
	   private final int top; 
	    
	   public BufferedImageLuminanceSource(BufferedImage image) {
	     this(image, 0, 0, image.getWidth(), image.getHeight()); 
	   } 
	    
	   public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {
	     super(width, height); 
	    
	     int sourceWidth = image.getWidth(); 
	     int sourceHeight = image.getHeight(); 
	     if (left + width > sourceWidth || top + height > sourceHeight) { 
	       throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
	     } 
	    
	     for (int y = top; y < top + height; y++) { 
	       for (int x = left; x < left + width; x++) { 
	         if ((image.getRGB(x, y) & 0xFF000000) == 0) { 
	           image.setRGB(x, y, 0xFFFFFFFF); // = white 
	         } 
	       } 
	     } 
	    
	     this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
	     this.image.getGraphics().drawImage(image, 0, 0, null); 
	     this.left = left; 
	     this.top = top; 
	   } 
	    
	   @Override
	   public byte[] getRow(int y, byte[] row) { 
	     if (y < 0 || y >= getHeight()) { 
	       throw new IllegalArgumentException("Requested row is outside the image: " + y);
	     } 
	     int width = getWidth(); 
	     if (row == null || row.length < width) { 
	       row = new byte[width]; 
	     } 
	     image.getRaster().getDataElements(left, top + y, width, 1, row); 
	     return row; 
	   } 
	    
	   @Override
	   public byte[] getMatrix() { 
	     int width = getWidth(); 
	     int height = getHeight(); 
	     int area = width * height; 
	     byte[] matrix = new byte[area]; 
	     image.getRaster().getDataElements(left, top, width, height, matrix); 
	     return matrix; 
	   } 
	    
	   @Override
	   public boolean isCropSupported() { 
	     return true; 
	   } 
	    
	   @Override
	   public LuminanceSource crop(int left, int top, int width, int height) { 
	     return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height); 
	   } 
	    
	   @Override
	   public boolean isRotateSupported() { 
	     return true; 
	   } 
	    
	   @Override
	   public LuminanceSource rotateCounterClockwise() { 
	    
	       int sourceWidth = image.getWidth(); 
	     int sourceHeight = image.getHeight(); 
	    
	     AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);
	    
	     BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);
	    
	     Graphics2D g = rotatedImage.createGraphics();
	     g.drawImage(image, transform, null); 
	     g.dispose(); 
	    
	     int width = getWidth(); 
	     return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width); 
	   }
}
